/* Hollow */
@mixin hollow {
	display: inline-block;
	$borderWidth: 4px;

	transition-duration: $defaultDuration;
	transition-property: background;

	@include hideTapHighlightColor();
	@include hardwareAccel();
	box-shadow: 
		inset 0 0 0 $borderWidth $primaryColour,
		0 0 1px rgba(0, 0, 0, 0); /* Hack to improve aliasing on mobile/tablet devices */

	&:hover {
		background: none;
	}
}